“Ventilation matters: Engineering airflow to avoid spreading COVID-19,” American Institute of Physics
https://phys.org/news/2021-11-ventilation-airflow-covid-.html As we approach two full years of the COVID-19 pandemic, we now know it spreads primarily through airborne transmission. The virus rides inside tiny microscopic droplets or aerosol ejected from our mouths when we speak, shout, sing, cough, or sneeze. It then floats within the air, where it can be inhaled by and transmitted. […]